力扣LeetCode 268. 缺失数字-白红宇

力扣LeetCode 268. 缺失数字

阅读量：273 次

发布时间：2019-03-01

本文共 638 字，大约阅读时间需要 2 分钟。

???????????????????????????????0?n?????????????????????????

????

???????????????????????????????

???????????????1?

???????????????0?

???????

???????res??????n?

??????????????res????????????i?

??res??????????

???????????O(n)????????????O(1)?

????

public int missingNumber(int[] nums) {    int res = nums.length; // ???????????    for (int i = 0; i < nums.length; ++i) {        res ^= nums[i]; // ?????????        res ^= i;     // ??????    }    return res; // ????}

????

???res??????res?????????n?

????????????????????

??????????????res ^= nums[i]?res ^= i???????????????????res??

???????res????????????res?????

???????????????????????????

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